JPH0320073Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an opening/closing timing detection device for a high-pressure container of a hydrostatic press.

[Prior Art] A conventional hydrostatic press will be explained with reference to FIGS. 2 to 4. A pedestal 2 erected on a base frame 1 is equipped with a high-pressure container 3 that presses a workpiece by supplying high-pressure fluid thereinto. , fixed base frame 1
A hydraulic cylinder 5 is installed on the rail 4 laid above.
A frame body 6 is placed thereon so that it can be moved by.

The frame body 6 is provided with a space 7 which is penetrated in the front and back so as to be able to support the high pressure container 3, and above the space 7 is provided with a space 7 which can be opened and closed by a vertically oriented fluid pressure cylinder 8. A spacer 11 is provided which can be moved horizontally by means of an upper lid 9 and a horizontally provided hydraulic cylinder 10.

Further, at the bottom of the space 7 in the frame 6,
A pedestal 13 for receiving the lower lid 12 of the high-pressure container 3 is provided. Further, the lower lid 12 is elastically suspended from the lower end of the outer periphery of the high-pressure container 3 by a suspension bolt 14 via a disc spring 15, as shown in FIG. When not in operation, the lower cover 12 is attached to the cradle 13 by the hanging bolts 14 and disc springs 15.
The high-pressure vessel 3 is supported with a required gap S between the high-pressure vessel 3 and the high-pressure vessel 3 so that it can be taken in and out of the space 7.
When working with a large pressure P acting inside the
The lower cover 12 is lowered against the disk spring 15,
It is adapted to be supported on a pedestal 13. In the figure, 16 indicates a seal.

When pressing is performed using the above device, the spacer 11 is retracted from the upper part of the upper lid 9 by the fluid pressure cylinder 10, and the spacer 11 is moved back from the upper part of the upper lid 9 by the fluid pressure spacer 8.
with the fluid pressure cylinder 5 in the uppermost position.
The frame body 6 is moved to the high pressure vessel 3 side by the frame body 6 so that the high pressure vessel 3 can be supported by the frame body 6, and the upper cover 9 is lowered by the fluid pressure cylinder 8. The upper part of the high-pressure container 3 is pressurized and sealed, a spacer 11 is inserted between the upper lid 9 and the frame 6 using the fluid pressure cylinder 10, and high-pressure fluid is fed into the high-pressure container 3 to store the workpieces inside. Perform isostatic pressing.

[Problems to be solved by the invention] However, in the case of the above-mentioned hydrostatic press, after the pressing operation is completed, the pressure inside the high-pressure container 3 is reduced to a required safe pressure, and then the top cover 9 is opened. However, since it was not possible to know when the pressure had dropped to a safe level, the timing of opening and closing the high-pressure vessel varied, resulting in time loss and lower productivity.

The present invention was developed by focusing on these conventional problems, and aims to improve productivity by reliably detecting the opening/closing timing when depressurizing a high-pressure vessel and reducing work loss time. .

[Means for Solving the Problems] The present invention is an attempt to solve the above-mentioned technical problem.The present invention is an attempt to solve the above-mentioned technical problem. A double rod type opening/closing cylinder with one rod end connected to the lower lid is provided, and the fluid pressure circuit of the opening/closing cylinder is provided with a reduced pressure set to the required fluid pressure to keep the lower lid attracted to the high pressure container. In addition to providing a valve, a detector is provided at a predetermined position on the upper fixing member to detect when the fluid pressure is reduced and the striker provided on the other rod of the opening/closing cylinder has risen to a predetermined position. This invention relates to an opening timing detection device for a high pressure container of a hydrostatic press.

[Function] Therefore, in the present invention, when the pressure inside the high-pressure container becomes lower than the set pressure of the pressure reducing valve in the opening/closing cylinder, the lower cover is naturally attracted to the high-pressure container, and the upper rod moves at this time. By activating the detector, the opening/closing timing of the high-pressure container can be reliably detected.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 shows an example of the present invention applied to the conventional hydrostatic press shown in FIGS. The lower end of the lower rod 19 of a plurality of vertical opening/closing cylinders 18 provided at equal intervals on the outer periphery is connected to the support bracket 17 via a pin 20, and the lower lid 12 is operated by the fluid pressure of the opening/closing cylinder 18. Configure to support.

The opening/closing cylinder 18 is of a double-rod type, and an upper rod 22 that protrudes upward opposite to the lower rod 19 fixed to the piston 21 has an upper rod.
A striker 23 and a stopper 24 are integrally formed.

Lower cover lifting drive side flow path 2 of the opening/closing cylinder 18
5 is provided with a pressure reducing valve 26 for setting the required working fluid pressure to attract the lower lid 12 toward the high pressure container 3 side (above). A limit switch 27 is provided at a predetermined position on the fixing member, and is actuated by a striker 23 at the upper end of the upper rod 22 when the lower cover 12 reaches the uppermost position. Reference numeral 28 in the figure is a collar detachably provided on the outer periphery of the upper rod 22. During normal operation, the collar 28 allows the stroke of the opening/closing cylinder 18 to be slightly smaller than the gap S between the lower cover 12 and the pedestal 13. Hold it at a large stroke A (A=S+α),
Therefore, airtightness is always ensured by the seal 16, and maintenance such as replacing the seal 16 can be performed by removing the collar 28 and lowering (opening) the lower cover 12 by the stroke of the opening/closing cylinder 18. This is to make it possible.

The opening/closing cylinder 18 is set to a required fluid pressure by the pressure reducing valve 26 to maintain the lower lid 12 in a state where it is attracted to the lower end of the high pressure container 3.
Therefore, a gap S is always created between the frame body 6 and the pedestal 13, so that the frame body 6 can be inserted into and taken out from the high-pressure container 3.

During press work, the lower lid 12 is pushed down by the high pressure P acting within the high pressure container 3 and the cradle 1 is pushed down.
It is supported on 3.

When the high-pressure vessel 3 is opened for replacing the workpiece after pressing work is completed, first open the high-pressure vessel 3.
Gradually reduce the pressure inside. As the pressure reduction progresses and the internal pressure P of the high-pressure container 3 becomes smaller than the set pressure by the pressure-reducing valve 26, the tensile force of the opening/closing cylinder 18 overcomes the internal pressure of the high-pressure container 3 and lifts the lower lid 12, and finally As the upper rod 22 rises, the striker 23 operates the limit switch 27. Thereby, it is possible to detect that the internal pressure of the high-pressure container 3 has dropped to a constant pressure.

Therefore, the upper cover 9 (FIG. 2) can be opened safely and without time loss and the next operation can be carried out.

It should be noted that the present invention is not limited to the above embodiments, and the limit switch may be either a contact type or a non-contact type, and the striker can be provided so as to be freely movable on the rod and fixed at a predetermined position. Of course, the pressure setting by the pressure reducing valve can be changed as desired, and various other changes can be made without departing from the gist of the present invention.

[Effect of the invention] As described above, according to the opening timing detection device for the high-pressure container of the hydrostatic press of the present invention, when the pressure inside the high-pressure container becomes lower than the set pressure of the pressure reducing valve in the opening cylinder, the lower lid automatically opens. The detector is activated by the movement of the upper rod at this time, so it is possible to reliably detect when the pressure inside the high-pressure container has fallen to a certain level. As a result, it is possible to reliably know when to open the high-pressure container, perform work efficiently, and improve productivity.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing one embodiment of the present invention;
The figure is an overall front view showing an example of a conventional hydrostatic press, FIG. 3 is a view taken from the - arrow in FIG. 2, FIG. 4 is a view taken from the - arrow in FIG. 2, and FIG. FIG. 1 is a base frame, 2 is a pedestal, 3 is a high pressure container, 4 is a rail, 5 is a fluid pressure cylinder, 6 is a frame, 7 is a space, 9 is an upper lid, 12 is a lower lid, 13 is a pedestal, 16 is seal, 17 is a support bracket;
18 is an opening/closing cylinder, 19 is a lower rod, 22 is an upper rod, 23 is a striker, 26 is a pressure reducing valve,
27 indicates a limit switch.

Claims (1)

[Scope of utility model registration request] A double-rod opening/closing cylinder with one rod end connected to the lower lid is provided on the outer periphery of the high-pressure container that stores and pressurizes the workpiece inside, so as to open and close the lower lid of the high-pressure container. In the pressure circuit,
A pressure reducing valve is provided at the required fluid pressure to keep the lower lid attracted to the high pressure container, and a striker is provided on the other rod of the opening/closing cylinder so that the fluid pressure is reduced at a required position on the upper fixing member. 1. An opening timing detection device for a high-pressure container of a hydrostatic press, characterized in that a detector is provided to detect when the container has risen to a predetermined position.